[tonyedwardspz]

Summary

• Add UTM tracking to sponsor and supporter links on current and archived event pages: utm_source=maui-day, utm_medium=website, utm_campaign=<event-id>, and utm_content=sponsor-section.
• Define event IDs for named conference configs and reuse existing archive IDs.
• Preserve existing destination query parameters and fragments; return the original URL unchanged when an event ID is missing or blank.
• Document tracking behavior and add focused regression tests.

Validation

• node --experimental-strip-types --test tests/sponsor-url.test.mjs (6 passing tests)
• npm run build
• Verified 72 rendered sponsor/supporter links across 14 event pages against the expected tracking parameters.